McQuay TGZ 050 Operation and Maintenance Manual

McQuay
Brand
McQuay
Model
TGZ 050
Type
Operation and Maintenance Manual
Operation and Maintenance Manual
OMM TGZ-1
Group: Chiller
Part Number: 331975601
Effective: February 2011
Supercedes: June 2009
TGZ Scroll Compressor Templifiers
TGZ 040A to TGZ 190A, Packaged Water Heater
600 to 3100 MBH
R134a
Software: WGZDU0102E
Corrections
2/22/11 Changed/added setpoints pgs 62, 63,+
2 TGZ 040A through TGZ 190A OMM TGZ-1
Table of Contents
Introduction ........................................... 3
General Description .......................................... 3
Nomenclature.................................................... 3
Water Pressure Drop ............................. 3
TGZ Scroll........................................................ 4
TGZ Electrical Data.............................. 7
Field Wiring Diagram ......................... 16
Start-Up and Shutdown ...................... 18
Pre Start-up ..................................................... 18
Start-up ........................................................... 18
Weekend or Temporary Shutdown.................. 19
Start-up after Temporary Shutdown................ 19
Extended Shutdown ........................................ 19
Start-up after Extended Shutdown .................. 19
Sequence of Operation ........................ 20
MicroTech II Controller...................... 23
TGZ Controller Software Version................... 23
General Description ........................................ 23
Inputs and Outputs ............................. 25
Large PCO2/PCO3 Controller ........................ 25
Expansion I/O Controller................................ 27
Setpoints ......................................................... 27
Events & Alarms.................................. 30
Protection (Shutdown) Alarms........................ 30
Alarms and Events .............................. 30
Unit Stop Alarms............................................. 30
Limit Events.................................................... 34
Controller Operation ...........................37
EXV Control ................................................... 52
Using the Controller.............................53
Menu Screens.................................................. 55
Menu Descriptions .......................................... 55
BAS Interface ................................................. 72
Optional Controls.................................74
Part Winding Start........................................... 74
Phase/Voltage Monitor (Optional) .................. 74
Hot Gas Bypass (Optional) ............................. 74
System Maintenance ............................76
General............................................................ 76
Electrical Terminals ........................................ 77
Operating Limits ............................................. 77
Compressor Oil ............................................... 77
Oil Equalization .............................................. 78
Sightglass and Moisture Indicator................... 78
Crankcase Heaters........................................... 78
System Service......................................79
Filter-Driers..................................................... 79
Liquid Line Solenoid Valve ............................ 79
Troubleshooting Chart ........................80
©2007 McQuay International. Illustrations and data cover the McQuay International product at the time of publication and we reserve
the right to make changes in design and construction at anytime without notice. ™® The following are trademarks or registered
trademarks of their respective companies: BACnet from ASHRAE;
L
ON
M
ARK
, LonTalk, L
ON
W
ORKS
, and the L
ON
M
ARK
logo are
managed, granted and used by L
ON
M
ARK
International under a license granted by Echelon Corporation; Compliant Scroll from Copeland
Corporation; Modbus from Schneider Electric; MicroTech II and Open Choices from McQuay International
Manufactured in an ISO Certified facility
OMM TGZ-1 TGZ 040A through TGZ 190A 3
Introduction
General Description
McQuay Type TGZ water heaters are scroll compressor refrigeration units that recover heat from warm
fluid streams in the evaporator and deliver hot water, at a useful temperature, from the condenser to a
heating load. They are designed for indoor installations only and are completely assembled, wired,
charged and tested. Each unit consists of four or six (depending on unit size) scroll compressors,
brazed-plate evaporators on models 040 to 120 and shell-and-tube evaporators on models 150 to 190,
shell-and-tube condenser/heater, and complete refrigerant piping.
There are two refrigerant circuits, each with manual liquid line shutoff valves, charging valves, filter-
driers, liquid line solenoid valves, sightglass/moisture indicators, and expansion valves (thermal on
TGZ 040-120, electronic on TGZ 150-190.
The electrical control center includes a MicroTech II control system and other components necessary
for dependable automatic operation.
NOTE: Additional information not included in this manual, such as unit dimensions and weights,
physical data, and performance data can be found in Catalog Templifier-1.
Nomenclature
T G Z 100 A
Water Pressure Drop
The vessel flow rates must fall between the minimum and maximum values shown on the appropriate
evaporator and condenser curves on pages 4 through 6. Flow rates below the minimum values shown will
result in laminar flow that will reduce efficiency, cause erratic operation of the expansion valve and could
cause low temperature cutoffs. On the other hand, flow rates exceeding the maximum values shown can cause
erosion on the evaporator water connections and tubes.
Measure the water pressure drop through the vessels at field installed pressure taps. It is important not to
include valves or strainers in these readings.
The condenser flow rate will determine whether 2-pass or 4-pass condensers are used, according to the
following table:
CONDENSER DELTA-T PASSES FLOW
10- to 20 Degrees F 2-Pass High Flow Rate
20 to 40 Degrees F 4-Pass Low Flow Rate
The entering water should be piped to the bottom connection of the condenser and out the top.
Templifier
Global
Scroll Compressor
Vintage
Nominal Evaporator
Capacity in Tons
4 TGZ 040A through TGZ 190A OMM TGZ-1
TGZ Scroll
Figure 1, Evaporator Pressure Drop
MINIMUM FLOW RATE NOMINAL FLOW RATE MAXIMUM FLOW RATE
INCH-POUND
S.I. INCH-POUND
S.I. INCH-POUND
S.I.
TGZ UNIT
MODEL
EVAPORATOR
MODEL
GPM FT. L/S KPA GPM FT. LPS KPA GPM FT. LPS KPA
040A
AC250-70DQ 34 1.1 2.1 3.2 72 4.4 4.5 13.2 120 11.6 7.6 34.7
050A
AC250-94DQ 45 1.0 2.8 3.1 100 4.7 6.3 14.0 167 12.5 10.5 37.2
060A
AC250-94DQ 55 1.5 3.5 4.5 121 6.7 7.6 20.0 202 17.7 12.7 53.0
080A
AC350-162DQ 83 1.4 5.2 4.3 162 5.1 10.2 15.2 270 13.5 17.0 40.2
100A
AC350-162DQ 98 2.0 6.2 5.8 189 6.8 11.9 20.3 315 17.9 19.9 53.6
110A
AC350-182DQ 113 2.2 7.1 6.4 218 7.5 13.8 22.4 363 19.8 22.9 59.1
120A
AC350-182DQ 128 2.7 8.1 8.2 246 9.5 15.5 28.4 410 25.1 25.9 74.9
150A
EV34191111/9 147 2.4 9.3 7.3 283 8.5 17.9 25.4 472 22.5 29.8 67.1
170A
EV34191212/7 169 3.5 10.7
10.5 326 12.2 20.6 36.5 543 32.2 34.3 96.1
190A EV34191212/7 192 4.5 12.1
13.4 369 15.5 23.3 46.3 615 40.9 38.8 122.3
Note: Nominal Flow Rate is gpm for 10ºF Delta-T at unit operating conditions of evaporator at 75/65ºF water temp and condenser at
110/30º F water temp.
TGZ Evaporator Water Pressure Drop
TGZ040
TGZ050
TGZ060
TGZ080
TGZ100
TGZ110
TGZ120
TGZ150
TGZ170
TGZ190
1
10
100
10 100 1000
Flow Rate (gpm)
Dp (ft)
TGZ040
TGZ050
TGZ060
TGZ080
TGZ100
TGZ110
TGZ120
TGZ150
TGZ170
TGZ190
OMM TGZ-1 TGZ 040A through TGZ 190A 5
Figure 2, Standard Four-pass Condenser Pressure Drop
TGZ 4-Pass Condenser Water Pressure Drop
TGZ170
TGZ040
TGZ050
TGZ060
TGZ080
TGZ100
TGZ110
TGZ120
TGZ150
TGZ190
1
10
100
10 100 1000
Flow Rate (gpm)
Dp (ft)
TGZ040
TGZ050
TGZ060
TGZ080
TGZ100
TGZ110
TGZ120
TGZ150
TGZ170
TGZ190
MINIMUM FLOW RATE NOMINAL FLOW RATE MAXIMUM FLOW RATE
INCH-POUND
S.I. INCH-POUND
S.I. INCH-POUND
S.I.
TGZ UNIT
MODEL
COND.
MODEL
GPM FT L/S KPA GPM FT L/S KPA GPM
FT L/S KPA
TGZ040
C1010-62
23 1.93 1.45 5.77 47 7.5 3.0 22.4 63 13.1 4.0 39.1
TGZ050
C1010-62
32 2.44 2.02 7.29 64 9.1 4.0 27.2 86 16.0 5.4 47.7
TGZ060
C1010-76
38 3.40 2.40 10.16 77 13.0 4.9 38.9 103 22.6 6.5 67.5
TGZ080
C1410-112
51 2.84 3.22 8.49 103 10.8 6.5 32.3 138 18.8 8.7 56.3
TGZ100
C1410-128
60 3.00 3.79 8.97 120 11.2 7.6 33.5 160 19.3 10.1 57.8
TGZ110
C1610-164
69 2.44 4.35 7.29 138 9.1 8.7 27.2 184 15.7 11.6 47.0
TGZ120
C1610-164
78 3.08 4.92 9.21 156 11.5 9.8 34.4 208 19.9 13.1 59.4
TGZ150
C1612-164
90 4.85 5.68 14.50 180 18.1 11.4 54.1 240 31.3 15.1 93.4
TGZ170
C1612-184
103 4.89 6.50 14.60 207 18.4 13.1 55.0 276 31.8 17.4 95.0
TGZ190
C1612-184
117 6.24 7.38 18.66 234 23.3 14.8 69.6 312 40.2 19.7 120.3
6 TGZ 040A through TGZ 190A OMM TGZ-1
Figure 3, Optional Two-pass Condenser
MINIMUM FLOW RATE NOMINAL FLOW RATE MAXIMUM FLOW RATE
INCH-POUND S.I.
INCH-
POUND
S.I. INCH-POUND S.I.
TGZ UNIT
MODEL
COND.
MODEL.
GPM FT L/S KPA GPM FT L/S KPA GPM FT LPS KPA
TGZ040
C1010-62 59 1.6 3.7 4.9 94 4.0 5.9 12.0 150 9.8 9.5 29.3
TGZ050
C1010-62 80 2.0 5.0 6.0 128 4.9 8.1 14.6 205 12.0 12.9 35.8
TGZ060
C1010-76 96 2.9 6.1 8.5 154 7.0 9.7 20.9 246 17.0 15.5 51.0
TGZ080
C1410-112 129 2.4 8.1 7.1 206 5.8 13.0 17.3 330 14.2 20.8 42.3
TGZ100
C1410-128 150 2.5 9.5 7.3 240 6.0 15.1 17.9 384 14.7 24.2 43.8
TGZ110
C1610-164 173 2.0 10.9 6.0 276 4.9 17.4 14.6 442 12.0 27.9 35.8
TGZ120
C1610-164 195 2.5 12.3 7.6 312 6.2 19.7 18.5 499 15.1 31.5 45.3
TGZ150
C1612-164 225 3.3 14.2 9.9 360 8.1 22.7 24.2 576 19.8 36.3 59.1
TGZ170
C1612-184 259 3.5 16.3 10.4 414 8.5 26.1 25.4 662 20.8 41.8 62.1
TGZ190
C1612-184 293 4.4 18.5 13.2 468 10.8 29.5 32.3 749 26.4 47.2 78.8
TGZ 2-Pass Condenser Water Pressure Drop
TGZ170
TGZ040
TGZ050
TGZ060
TGZ080
TGZ100
TGZ110
TGZ120
TGZ150
TGZ190
1
10
100
10 100 1000
Flow Rate (gpm)
Dp (ft)
TGZ040
TGZ050
TGZ060
TGZ080
TGZ100
TGZ110
TGZ120
TGZ150
TGZ170
TGZ190
OMM TGZ-1 TGZ 040A through TGZ 190A 7
TGZ Electrical Data
Table 1, Compressor Amp Draw
STANDARD UNIT W/O EXT. OL'S
RATED LOAD
AMPS
OPTIONAL UNIT WITH EXT. OL'S
RATED LOAD AMPS (SEE
NOTE 1)
LOCKED ROTOR AMPS
COMPRESSORS
CIRCUIT 1 CIRCUIT 2 CIRCUIT 1 CIRCUIT 2 CIRCUIT 1 CIRCUIT 2
TGZ
UNIT
SIZE
VOLTS
FREQ.
(HERTZ)
No.1
No.3
No.5
No.2
No.4 No.6
No.1
No.3
No.5
No.2
No.4
No.6
No.1
No.3
No.5
No.2
No.4
No.6
208 35.3
35.3
- 35.3
35.3 - 30.8
30.8
- 30.8
30.8
- 239 239
- 239 239
-
230 35.3
35.3
- 35.3
35.3 - 28.0
28.0
- 28.0
28.0
- 239 239
- 239 239
-
460 17.9
17.9
- 17.9
17.9 - 14.0
14.0
- 14.0
14.0
- 125 125
- 125 125
-
040
575
60
11.5
11.5
- 11.5
11.5 - 11.2
11.2
- 11.2
11.2
- 80 80 - 80 80 -
208 48.1
48.1
- 48.1
48.1 - 42.0
42.0
- 42.0
42.0
- 300 300
- 300 300
-
230 48.1
48.1
- 48.1
48.1 - 38.4
38.4
- 38.4
38.4
- 300 300
- 300 300
-
460 21.8
21.8
- 21.8
21.8 - 19.2
19.2
- 19.2
19.2
- 150 150
- 150 150
-
050
575
60
19.9
19.9
- 19.9
19.9 - 15.2
15.2
- 15.2
15.2
- 109 109
- 109 109
-
208 54.0
54.0
- 54.0
54.0 - 54.0
54.0
- 54.0
54.0
- 340 340
- 340 340
-
230 52.6
52.6
- 52.6
52.6 - 48.8
48.8
- 48.8
48.8
- 340 340
- 340 340
-
460 25.6
25.6
- 25.6
25.6 - 24.4
24.4
- 24.4
24.4
- 173 173
- 173 173
-
060
575
60
21.2
21.2
- 21.2
21.2 - 19.6
19.6
- 19.6
19.6
- 132 132
- 132 132
-
208 73.1
73.1
- 73.1
73.1 - 58.0
58.0
- 58.0
58.0
- 505 505
- 505 505
-
230 73.1
73.1
- 73.1
73.1 - 52.8
52.8
- 52.8
52.8
- 505 505
- 505 505
-
460 30.1
30.1
- 30.1
30.1 - 26.4
26.4
- 26.4
26.4
- 225 225
- 225 225
-
080
575
60
24.4
24.4
- 24.4
24.4 - 21.2
21.2
- 21.2
21.2
- 180 180
- 180 180
-
208 73.1
73.1
- 73.1
73.1 - 69.2
69.2
- 69.2
69.2
- 500 500
- 500 500
-
230 73.1
73.1
- 73.1
73.1 - 62.4
62.4
- 62.4
62.4
- 500 500
- 500 500
-
460 35.3
35.3
- 35.3
35.3 - 31.2
31.2
- 31.2
31.2
- 250 250
- 250 250
-
100
575
60
28.2
28.2
- 28.2
28.2 - 25.2
25.2
- 25.2
25.2
- 198 198
- 198 198
-
208 73.1
73.1
- 93.6
93.6 - 69.2
69.2
- 88.8
88.8
- 500 500
- 599 599
-
230 73.1
73.1
- 93.6
93.6 - 62.4
62.4
- 80.0
80.0
- 500 500
- 599 599
-
460 35.3
35.3
- 45.5
45.5 - 31.2
31.2
- 40.0
40.0
- 250 250
- 310 310
-
110
575
60
28.2
28.2
- 36.5
36.5 - 25.2
25.2
- 32.0
32.0
- 198 198
- 239 239
-
208 93.6
93.6
- 93.6
93.6 - 88.8
88.8
- 88.8
88.8
- 599 599
- 599 599
-
230 93.6
93.6
- 93.6
93.6 - 80.0
80.0
- 80.0
80.0
- 599 599
- 599 599
-
460 45.5
45.5
- 45.5
45.5 - 40.0
40.0
- 40.0
40.0
- 310 310
- 310 310
-
120
575
60
36.5
36.5
- 36.5
36.5 - 32.0
32.0
- 32.0
32.0
- 239 239
- 239 239
-
208 73.1
73.1
73.1
73.1
73.1 73.1
69.2
69.2
69.2
69.2
69.2
69.2
500 500
500 500 500
500
230 73.1
73.1
73.1
73.1
73.1 73.1
62.4
62.4
62.4
62.4
62.4
62.4
500 500
500 500 500
500
460 35.3
35.3
35.3
35.3
35.3 35.3
31.2
31.2
31.2
31.2
31.2
31.2
250 250
250 250 250
250
150
575
60
28.2
28.2
28.2
28.2
28.2 28.2
25.2
25.2
25.2
25.2
25.2
25.2
198 198
198 198 198
198
208 73.1
73.1
73.1
93.6
93.6 93.6
69.2
69.2
69.2
88.8
88.8
88.8
500 500
500 599 599
599
230 73.1
73.1
73.1
93.6
93.6 93.6
62.4
62.4
62.4
80.0
80.0
80.0
500 500
500 599 599
599
460 35.3
35.3
35.3
45.5
45.5 45.5
31.2
31.2
31.2
40.0
40.0
40.0
250 250
250 310 310
310
170
575
60
28.2
28.2
28.2
36.5
36.5 36.5
25.2
25.2
25.2
32.0
32.0
32.0
198 198
198 239 239
239
208 93.6
93.6
93.6
93.6
93.6 93.6
88.8
88.8
88.8
88.8
88.8
88.8
599 599
599 599 599
599
230 93.6
93.6
93.6
93.6
93.6 93.6
80.0
80.0
80.0
80.0
80.0
80.0
599 599
599 599 599
599
460 45.5
45.5
45.5
45.5
45.5 45.5
40.0
40.0
40.0
40.0
40.0
40.0
310 310
310 310 310
310
190
575
60
36.5
36.5
36.5
36.5
36.5 36.5
32.0
32.0
32.0
32.0
32.0
32.0
239 239
239 239 239
239
NOTES:
1. External overloads only available on Templifier units with 140°F maximum condenser leaving water temperature.
2. Unit wire sizing amps are equal to 125% of the largest compressor-motor RLA plus 100% of RLA of all other loads in the circuit including control
transformer.
3. Single point power supply requires a single fused disconnect to supply electrical power to the unit.
4. Compressor RLA values are for wire sizing purposes only and do not reflect normal operating current draw.
8 TGZ 040A through TGZ 190A OMM TGZ-1
Table 2, Wire Sizing Amps, Standard Multi-Point Power Supply
MINIMUM CIRCUIT AMPACITY (MCA) POWER SUPPLY
WITHOUT EXTTERNAL
OVERLOADS
WITH EXTERNAL
OVERLOADS
WITHOUT EXTERNAL
OVERLOADS
WITH EXTERNAL
OVERLOADS
MULTIPLE POINT POWER SUPPLY
WIRE GAUGE
75
°
°°
°
C
WIRE GAUGE
75
°
°°
°
C
TGZ
UNIT
SIZE
VOLTS
FREQ.
(HERTZ)
CIRCUIT
NO.1
CIRCUIT
NO.2
CIRCUIT
NO.1
CIRCUIT
NO.2
FIELD
WIRE
QTY.
CIRCUIT
NO.1
CIRCUIT
NO.2
FIELD
WIRE
QTY.
CIRCUIT
NO.1
CIRCUIT
NO.2
208 79 79 69 69 3 #4 #4 3 #4 #4
230 79 79 63 63 3 #4 #4 3 #6 #6
460 40 40 32 32 3 #8 #8 3 #10 #10
040
575
60
26 26 25 25 3 #10 #10 3 #10 #10
208 108 108 95 95 3 #2 #2 3 #3 #3
230 108 108 86 86 3 #2 #2 3 #3 #3
460 49 49 43 43 3 #8 #8 3 #8 #8
050
575
60
45 45 34 34 3 #8 #8 3 #10 #10
208 122 122 122 122 3 #1 #1 3 #1 #1
230 118 118 110 110 3 #1 #1 3 #2 #2
460 58 58 55 55 3 #6 #6 3 #6 #6
060
575
60
48 48 44 44 3 #8 #8 3 #8 #8
208 165 165 131 131 3 2/0 2/0 3 1/0 1/0
230 165 165 119 119 3 2/0 2/0 3 #1 #1
460 68 68 59 59 3 #4 #4 3 #6 #6
080
575
60
55 55 48 48 3 #6 #6 3 #8 #8
208 165 165 156 156 3 2/0 2/0 3 2/0 2/0
230 165 165 140 140 3 2/0 2/0 3 1/0 1/0
460 79 79 70 70 3 #4 #4 3 #4 #4
100
575
60
64 64 57 57 3 #6 #6 3 #6 #6
208 165 211 156 200 3 2/0 4/0 3 2/0 3/0
230 165 211 140 180 3 2/0 4/0 3 1/0 3/0
460 79 102 70 90 3 #4 #2 3 #4 #3
110
575
60
64 82 57 72 3 #6 #4 3 #6 #4
208 211 211 200 200 3 4/0 4/0 3 3/0 3/0
230 211 211 180 180 3 4/0 4/0 3 3/0 3/0
460 102 102 90 90 3 #2 #2 3 #3 #3
120
575
60
82 82 72 72 3 #4 #4 3 #4 #4
208 238 238 225 225 3 250 250 3 4/0 4/0
230 238 238 203 203 3 250 250 3 4/0 4/0
460 115 115 101 101 3 #2 #2 3 #2 #2
150
575
60
92 92 82 82 3 #3 #3 3 #4 #4
208 238 304 225 289 3 250 350 3 4/0 350
230 238 304 203 260 3 250 350 3 4/0 300
460 115 148 101 130 3 #2 1/0 3 #2 #1
170
575
60
92 119 82 104 3 #3 #1 3 #4 #2
208 304 304 289 289 3 350 350 3 350 350
230 304 304 260 260 3 350 350 3 300 300
460 148 148 130 130 3 1/0 1/0 3 #1 #1
190
575
60
119 119 104 104 3 #1 #1 3 #2 #2
NOTES:
1. Unit wire sizing amps are equal to 125% of the largest compressor-motor RLA plus 100% of the other compressor RLA's.
2. Multiple point power supply requires a separate fused disconnect for each circuit to supply electrical power to the unit.
3. External compressor overload option is only available for units with 140° F maximum leaving condenser water temperature.
4. Wire sizes shown above are for standard ambient temperature and short runs of wire.
OMM TGZ-1 TGZ 040A through TGZ 190A 9
Table 3, Wire Sizing Amps, Optional Single Point Power Supply
MINIMUM CIRCUIT AMPACITY (MCA) POWER SUPPLY
WITHOUT EXTERNAL OL'S
WITH EXTERNAL OL’S
TGZ
UNIT
SIZE
VOLTS
FREQ.
(HERTZ)
SINGLE POINT
POWER SUPPLY )
WITHOUT EXT OL'S
SINGLE POINT
POWER SUPPLY
WITH EXT OL'S
FIELD WIRE
QUANTITY
WIRE GAUGE
75°
°°
°C
FIELD WIRE
QUANTITY
WIRE GAUGE
75°
°°
°C
208
150
131
3
1/0
3
1/0
230 150 119 3 1/0 3 #1
460 76 60 3 #4 3 #6
040
575
60
49 48 3 #8 3 #8
208 204 179 3 4/0 3 3/0
230 204 163 3 4/0 3 2/0
460 93 82 3 #3 3 #4
050
575
60
85 65 3 #4 3 #6
208 230 230 3 4/0 3 4/0
230 224 207 3 4/0 3 4/0
460 109 104 3 #2 3 #2
060
575
60
90 83 3 #3 3 #4
208 311 247 3 400 3 250
230 311 224 3 400 3 4/0
460 128 112 3 #1 3 #2
080
575
60
104 90 3 #2 3 #3
208 311 294 3 400 3 350
230 311 265 3 400 3 300
460 150 133 3 1/0 3 1/0
100
575
60
120 107 3 #1 3 #2
208 357 338 6 (2) 3/0 6 (2) 2/0
230 357 305 6 (2) 3/0 3 350
460 173 152 3 2/0 3 2/0
110
575
60
139 122 3 1/0 3 #1
208 398 377 6 (2) 3/0 6 (2) 3/0
230 398 340 6 (2) 3/0 6 (2) 2/0
460 193 170 3 3/0 3 2/0
120
575
60
155 136 3 2/0 3 1/0
208 457 433 6 (2) 4/0 6 (2) 4/0
230 457 390 6 (2) 4/0 6 (2) 3/0
460 221 195 3 4/0 3 3/0
150
575
60
176 158 3 3/0 3 2/0
208 524 496 6 (2) 300 6 (2) 250
230 524 447 6 (2) 300 6 (2) 4/0
460 254 224 3 250 3 4/0
170
575
60
203 180 3 4/0 3 3/0
208 585 555 6 (2) 350 6 (2) 300
230 585 500 6 (2) 350 6 (2) 250
460 284 250 3 300 3 250
190
575
60
228 200 3 4/0 3 3/0
NOTES:.
1. Unit wire sizing amps are equal to 125% of the largest compressor-motor RLA plus 100% of the other compressor RLA's.
2. Single point power supply requires a single fused disconnect to supply electrical power to the unit.
3. External compressor overload option is only available for units with 140° F maximum leaving condenser water temperature.
4. Wire Sizes shown above are for standard ambient temperature and short runs of wire.
10 TGZ 040A through TGZ 190A OMM TGZ-1
Table 4, Maximum Fuse Sizing
SINGLE POINT POWER SUPPLY MULTIPLE POINT POWER SUPPLY
WITHOUT EXTERNAL OL'S
WITH EXTERNAL OL'S
TGZ
UNIT
SIZE
VOLTAGE
PHASE
FREQ.
(HERTZ)
WITHOUT
EXTERNAL OL'S
TOTAL UNIT
WITH
EXTERNAL OL'S
TOTAL UNIT
CIRC.#1 CIRC.#2 CIRC.#1 CIRC.#2
208 175 150 110 110 100 100
230 175 125 110 110 90 90
460 90 70 50 50 45 45
040
575
60
60 50 35 35 35 35
208 250 200 150 150 125 125
230 250 200 150 150 110 110
460 110 100 70 70 60 60
050
575
60
100 70 60 60 45 45
208 250 250 175 175 175 175
230 250 250 150 150 150 150
460 125 125 80 80 70 70
060
575
60
110 100 60 60 60 60
208 350 300 225 225 175 175
230 350 250 225 225 150 150
460 150 125 90 90 80 80
080
575
60
125 110 70 70 60 60
208 350 350 225 225 200 200
230 350 300 225 225 200 200
460 175 150 110 110 100 100
100
575
60
125 125 90 90 80 80
208 450 400 225 300 200 250
230 450 350 225 300 200 250
460 200 175 110 125 100 125
110
575
60
175 150 90 110 80 100
208 450 450 300 300 250 250
230 450 400 300 300 250 250
460 225 200 125 125 125 125
120
575
60
175 150 110 110 100 100
208 500 500 300 300 250 250
230 500 450 300 300 250 250
460 250 225 150 150 125 125
150
575
60
200 175 110 110 100 100
208 600 500 300 350 250 350
230 600 500 300 350 250 300
460 250 250 150 175 125 150
170
575
60
225 200 110 150 100 125
208 600 600 350 350 350 350
230 600 500 350 350 300 300
460 300 250 175 175 150 150
190
575
60
350 225 150 150 125 125
NOTE:
1. "Maximum Fuse Sizes" are selected at approximately 225% of the largest compressor RLA plus 100% of other compressor RLA values.
OMM TGZ-1 TGZ 040A through TGZ 190A 11
Table 5, Connection Sizes, Single Point Power Supply, Without External Overloads
Power Block Terminal Factory Installed Disconnect Factory Installed HSCCR
Power Block or
Bus Bar Lugs
Disconnect Switch
Molded Case
Disconnect Switch
(Circuit Breaker )
Circ. Brkr Connection (2)
TGZ
Unit
Size
Volts
Freq.
(Hertz)
Size (1)
Connection (2)
Wire Range - CU
Switch
Size (1)
Connection (2)
Wire Range - CU
Size (1) Wire Range - CU
208 380 #4 - 500 kcmil 250 #6 - 350 kcmil 250 #6 - 350 kcmil
230 380 #4 - 500 kcmil 250 #6 - 350 kcmil 250 #6 - 350 kcmil
460 175 #14 - 2/0 100 #10 - 1/0 150 #6 - 350 kcmil
040
575
60
175 #14 - 2/0 100 #10 - 1/0 90 #10 - 1/0
208 380 #4 - 500 kcmil 250 #6 - 350 kcmil 350 (2) 3/0 - 500 kcmil
230 380 #4 - 500 kcmil 250 #6 - 350 kcmil 350 (2) 3/0 - 500 kcmil
460 175 #14 - 2/0 125 #3 - 3/0 175 #6 - 350 kcmil
050
575
60
175 #14 - 2/0 100 #10 - 1/0 150 #6 - 350 kcmil
208 380 #4 - 500 kcmil 250 #6 - 350 kcmil 400 (2) 3/0 - 500 kcmil
230 380 #4 - 500 kcmil 250 #6 - 350 kcmil 400 (2) 3/0 - 500 kcmil
460 175 #14 - 2/0 125 #3 - 3/0 200 #6 - 350 kcmil
060
575
60
175 #14 - 2/0 100 #10 - 1/0 150 #6 - 350 kcmil
208 380 #4 - 500 kcmil 400 (2) 3/0 - 500 kcmil 400 (2) 3/0 - 500 kcmil
230 380 #4 - 500 kcmil 400 (2) 3/0 - 500 kcmil 400 (2) 3/0 - 500 kcmil
460 175 #14 - 2/0 250 #6 - 350 kcmil 225 #6 - 350 kcmil
080
575
60
175 #14 - 2/0 125 #3 - 3/0 175 #6 - 350 kcmil
208 380 #4 - 500 kcmil 400 (2) 3/0 - 500 kcmil 600 (2) 3/0 - 500 kcmil
230 380 #4 - 500 kcmil 400 (2) 3/0 - 500 kcmil 600 (2) 3/0 - 500 kcmil
460 175 #14 - 2/0 250 #6 - 350 kcmil 250 #6 - 350 kcmil
100
575
60
175 #14 - 2/0 250 #6 - 350 kcmil 200 #6 - 350 kcmil
208 380 #4 - 500 kcmil 400 (2) 3/0 - 500 kcmil 600 (2) 3/0 - 500 kcmil
230 380 #4 - 500 kcmil 400 (2) 3/0 - 500 kcmil 600 (2) 3/0 - 500 kcmil
460 380 #4 - 500 kcmil 250 #6 - 350 kcmil 300 (2) 3/0 - 500 kcmil
110
575
60
175 #14 - 2/0 250 #6 - 350 kcmil 250 #6 - 350 kcmil
208 760 (2) #2 - 500 kcmil 600 (2) 3/0 - 500 kcmil 700 (2) 3/0 - 500 kcmil
230 760 (2) #2 - 500 kcmil 600 (2) 3/0 - 500 kcmil 700 (2) 3/0 - 500 kcmil
460 380 #4 - 500 kcmil 250 #6 - 350 kcmil 400 (2) 3/0 - 500 kcmil
120
575
60
175 #14 - 2/0 250 #6 - 350 kcmil 300 (2) 3/0 - 500 kcmil
208 760 (2) #2 - 500 kcmil 600 (2) 3/0 - 500 kcmil 800 (3) 1/0 - 500 kcmil
230 760 (2) #2 - 500 kcmil 600 (2) 3/0 - 500 kcmil 800 (3) 1/0 - 500 kcmil
460 380 #4 - 500 kcmil 250 #6 - 350 kcmil 400 (2) 3/0 - 500 kcmil
150
575
60
380 #4 - 500 kcmil 250 #6 - 350 kcmil 300 (2) 3/0 - 500 kcmil
208 760 (2) #2 - 500 kcmil 600 (2) 3/0 - 500 kcmil 1000 (3) 1/0 - 500 kcmil
230 760 (2) #2 - 500 kcmil 600 (2) 3/0 - 500 kcmil 1000 (3) 1/0 - 500 kcmil
460 380 #4 - 500 kcmil 400 (2) 3/0 - 500 kcmil 450 (2) 3/0 - 500 kcmil
170
575
60
380 #4 - 500 kcmil 250 #6 - 350 kcmil 350 (2) 3/0 - 500 kcmil
208 760 (2) #2 - 500 kcmil 800 (3) 1/0 - 500 kcmil 1000 (3) 1/0 - 500 kcmil
230 760 (2) #2 - 500 kcmil 800 (3) 1/0 - 500 kcmil 1000 (3) 1/0 - 500 kcmil
460 380 #4 - 500 kcmil 400 (2) 3/0 - 500 kcmil 500 (2) 3/0 - 500 kcmil
190
575
60
380 #4 - 500 kcmil 400 (2) 3/0 - 500 kcmil 400 (2) 3/0 - 500 kcmil
NOTES:.
1. "Size" is the maximum amperage rating for the terminals or the main electrical device...
2. "Connection" is the range of wire sizes that the terminals on the electrical device will accept.
12 TGZ 040A through TGZ 190A OMM TGZ-1
Table 6, Connection Sizes, Single Point Power Supply with External Overloads
Power Block Terminal Factory Installed Disconnect Factory Installed HSCCR
Power Block or
Bus Bar Lugs
Disconnect Switch
Molded Case
Disconnect Switch
(Circuit Breaker )
TGZ
Unit
Size
Volts
Freq.
(Hertz)
Size (1)
Connection (2)
Wire Range - CU
Switch
Size (1)
Connection (2)
Wire Range - CU
Circ. Brkr
Size (1)
Connection (2)
Wire Range - CU
208 335 #6 - 400 kcmil 250 #6 - 350 kcmil 250 #6 - 350 kcmil
230 335 #6 - 400 kcmil 250 #6 - 350 kcmil 250 #6 - 350 kcmil
460 175 #14 - 2/0 100 #3 - 3/0 150 #4 - 350 kcmil
040
575
60
175 #14 - 2/0 100 #3 - 3/0 150 #4 - 350 kcmil
208 335 #6 - 400 kcmil 250 #6 - 350 kcmil 250 #6 - 350 kcmil
230 335 #6 - 400 kcmil 250 #6 - 350 kcmil 250 #6 - 350 kcmil
460 175 #14 - 2/0 125 #3 - 3/0 125 #3 - 3/0
050
575
60
175 #14 - 2/0 100 #3 - 3/0 100 #3 - 3/0
208 335 #6 - 400 kcmil 250 #6 - 350 kcmil 400 (2) 3/0 - 500 kcmil
230 335 #6 - 400 kcmil 250 #6 - 350 kcmil 400 (2) 3/0 - 500 kcmil
460 175 #14 - 2/0 125 #3 - 3/0 125 #3 - 3/0
060
575
60
175 #14 - 2/0 100 #3 - 3/0 125 #3 - 3/0
208 760 (2) #2 - 500 kcmil 400 (2) 3/0 - 500 kcmil
400 (2) 3/0 - 500 kcmil
230 760 (2) #2 - 500 kcmil 400 (2) 3/0 - 500 kcmil
400 (2) 3/0 - 500 kcmil
460 335 #6 - 400 kcmil 250 #6 - 350 kcmil 250 #6 - 350 kcmil
080
575
60
335 #6 - 400 kcmil 125 #3 - 3/0 125 #3 - 3/0
208 760 (2) #2 - 500 kcmil 400 (2) 3/0 - 500 kcmil
600 (2) 3/0 - 500 kcmil
230 760 (2) #2 - 500 kcmil 400 (2) 3/0 - 500 kcmil
600 (2) 3/0 - 500 kcmil
460 335 #6 - 400 kcmil 250 #6 - 350 kcmil 250 #6 - 350 kcmil
100
575
60
335 #6 - 400 kcmil 250 #6 - 350 kcmil 250 #6 - 350 kcmil
208 760 (2) #2 - 500 kcmil 400 (2) 3/0 - 500 kcmil
600 (2) 3/0 - 500 kcmil
230 760 (2) #2 - 500 kcmil 400 (2) 3/0 - 500 kcmil
600 (2) 3/0 - 500 kcmil
460 335 #6 - 400 kcmil 250 #6 - 350 kcmil 250 #6 - 350 kcmil
110
575
60
335 #6 - 400 kcmil 250 #6 - 350 kcmil 250 #6 - 350 kcmil
208 760 (2) #2 - 500 kcmil 600 (2) 3/0 - 500 kcmil
600 (2) 3/0 - 500 kcmil
230 760 (2) #2 - 500 kcmil 600 (2) 3/0 - 500 kcmil
600 (2) 3/0 - 500 kcmil
460 335 #6 - 400 kcmil 250 #6 - 350 kcmil 400 (2) 3/0 - 500 kcmil
120
575
60
335 #6 - 400 kcmil 250 #6 - 350 kcmil 250 #6 - 350 kcmil
208 760 (2) #2 - 500 kcmil 600 (2) 3/0 - 500 kcmil
800 (3) 1/0 - 500 kcmil
230 760 (2) #2 - 500 kcmil 600 (2) 3/0 - 500 kcmil
800 (3) 1/0 - 500 kcmil
460 335 #6 - 400 kcmil 250 #6 - 350 kcmil 400 (2) 3/0 - 500 kcmil
150
575
60
335 #6 - 400 kcmil 250 #6 - 350 kcmil 250 #6 - 350 kcmil
208 760 (2) #2 - 500 kcmil 800 (3) 1/0 - 500 kcmil
800 (3) 1/0 - 500 kcmil
230 760 (2) #2 - 500 kcmil 800 (3) 1/0 - 500 kcmil
800 (3) 1/0 - 500 kcmil
460 335 #6 - 400 kcmil 400 (2) 3/0 - 500 kcmil
400 (2) 3/0 - 500 kcmil
170
575
60
335 #6 - 400 kcmil 250 #6 - 350 kcmil 400 (2) 3/0 - 500 kcmil
208 760 (2) #2 - 500 kcmil 800 (3) 1/0 - 500 kcmil
800 (3) 1/0 - 500 kcmil
230 760 (2) #2 - 500 kcmil 800 (3) 1/0 - 500 kcmil
800 (3) 1/0 - 500 kcmil
460 335 #6 - 400 kcmil 400 (2) 3/0 - 500 kcmil
400 (2) 3/0 - 500 kcmil
190
575
60
335 #6 - 400 kcmil 400 (2) 3/0 - 500 kcmil
400 (2) 3/0 - 500 kcmil
NOTES:
1. "Size" is the maximum amperage rating for the terminals or the main electrical device.
2. "Connection" is the range of wire sizes that the terminals on the electrical device will accept.
OMM TGZ-1 TGZ 040A through TGZ 190A 13
Table 7, Connection Sizes, Multi-Point Power Connection, without External Overloads
Power Terminal Block Factory Installed Disconnect
Circuit #1 Circuit #2 Circ.#1 Circ.#2
Molded Case
TGZ
Unit
Size
Volts
Power Block or
Bus Bar Lugs
Size (1)
Connection
Wire Range
(2)
Power Block/
Bus Bar Lugs
Size (1)
Connection (2)
Wire Range
Switch
Size (1)
Connection (2)
Wire Range
Switch
Size (1)
Connection (2)
Wire Range U
208 175 #14 - 2/0 175 #14 - 2/0 100 #10 - 1/0 100 #10 - 1/0
230 175 #14 - 2/0 175 #14 - 2/0 100 #10 - 1/0 100 #10 - 1/0
460 175 #14 - 2/0 175 #14 - 2/0 100 #10 - 1/0 100 #10 - 1/0
040
575 175 #14 - 2/0 175 #14 - 2/0 100 #10 - 1/0 100 #10 - 1/0
208 175 #14 - 2/0 175 #14 - 2/0 125 #3 - 3/0 125 #3 - 3/0
230 175 #14 - 2/0 175 #14 - 2/0 125 #3 - 3/0 125 #3 - 3/0
460 175 #14 - 2/0 175 #14 - 2/0 100 #10 - 1/0 100 #10 - 1/0
050
575 175 #14 - 2/0 175 #14 - 2/0 100 #10 - 1/0 100 #10 - 1/0
208 175 #14 - 2/0 175 #14 - 2/0 125 #3 - 3/0 125 #3 - 3/0
230 175 #14 - 2/0 175 #14 - 2/0 125 #3 - 3/0 125 #3 - 3/0
460 175 #14 - 2/0 175 #14 - 2/0 100 #10 - 1/0 100 #10 - 1/0
060
575 175 #14 - 2/0 175 #14 - 2/0 100 #10 - 1/0 100 #10 - 1/0
208 175 #14 - 2/0 175 #14 - 2/0 250 #6 - 350 kcmil 250 #6 - 350 kcmil
230 175 #14 - 2/0 175 #14 - 2/0 250 #6 - 350 kcmil 250 #6 - 350 kcmil
460 175 #14 - 2/0 175 #14 - 2/0 100 #10 - 1/0 100 #10 - 1/0
080
575 175 #14 - 2/0 175 #14 - 2/0 100 #10 - 1/0 100 #10 - 1/0
208 175 #14 - 2/0 175 #14 - 2/0 250 #6 - 350 kcmil 250 #6 - 350 kcmil
230 175 #14 - 2/0 175 #14 - 2/0 250 #6 - 350 kcmil 250 #6 - 350 kcmil
460 175 #14 - 2/0 175 #14 - 2/0 100 #10 - 1/0 100 #10 - 1/0
100
575 175 #14 - 2/0 175 #14 - 2/0 100 #10 - 1/0 100 #10 - 1/0
208 380 #4 - 500 kcmil
380 #4 - 500 kcmil
250 #6 - 350 kcmil 250 #6 - 350 kcmil
230 380 #4 - 500 kcmil
380 #4 - 500 kcmil
250 #6 - 350 kcmil 250 #6 - 350 kcmil
460 175 #14 - 2/0 175 #14 - 2/0 100 #10 - 1/0 125 #3 - 3/0
110
575 175 #14 - 2/0 175 #14 - 2/0 100 #10 - 1/0 100 #10 - 1/0
208 380 #4 - 500 kcmil
380 #4 - 500 kcmil
250 #6 - 350 kcmil 250 #6 - 350 kcmil
230 380 #4 - 500 kcmil
380 #4 - 500 kcmil
250 #6 - 350 kcmil 250 #6 - 350 kcmil
460 175 #14 - 2/0 175 #14 - 2/0 125 #3 - 3/0 125 #3 - 3/0
120
575 175 #14 - 2/0 175 #14 - 2/0 100 #10 - 1/0 100 #10 - 1/0
208 380 #4 - 500 kcmil
380 #4 - 500 kcmil
400 (2) 3/0 - 500 kcmil
400 (2) 3/0 - 500 kcmil
230 380 #4 - 500 kcmil
380 #4 - 500 kcmil
400 (2) 3/0 - 500 kcmil
400 (2) 3/0 - 500 kcmil
460 175 #14 - 2/0 175 #14 - 2/0 125 #3 - 3/0 125 #3 - 3/0
150
575 175 #14 - 2/0 175 #14 - 2/0 125 #3 - 3/0 125 #3 - 3/0
208 380 #4 - 500 kcmil
380 #4 - 500 kcmil
400 (2) 3/0 - 500 kcmil
400 (2) 3/0 - 500 kcmil
230 380 #4 - 500 kcmil
380 #4 - 500 kcmil
400 (2) 3/0 - 500 kcmil
400 (2) 3/0 - 500 kcmil
460 175 #14 - 2/0 175 #14 - 2/0 250 #6 - 350 kcmil 250 #6 - 350 kcmil
170
575 175 #14 - 2/0 175 #14 - 2/0 125 #3 - 3/0 250 #6 - 350 kcmil
208 380 #4 - 500 kcmil
380 #4 - 500 kcmil
400 (2) 3/0 - 500 kcmil
400 (2) 3/0 - 500 kcmil
230 380 #4 - 500 kcmil
380 #4 - 500 kcmil
400 (2) 3/0 - 500 kcmil
400 (2) 3/0 - 500 kcmil
460 175 #14 - 2/0 175 #14 - 2/0 250 #6 - 350 kcmil 250 #6 - 350 kcmil
190
575 175 #14 - 2/0 175 #14 - 2/0 250 #6 - 350 kcmil 250 #6 - 350 kcmil
14 TGZ 040A through TGZ 190A OMM TGZ-1
Table 8, Connection Sizes, Multi-Point Power Connection, with External Overloads
Power Terminal Block Factory Installed Disconnect
Circuit #1 Circuit #2 Circ.#1 Circ.#2
Molded Case
TGZ
Unit
Size
Volts
Power Block or
Bus Bar Lugs
Size
Connection)
Wire Range
Power Block or
Bus Bar Lugs
Size
Connection
Wire Range
Switch
Size
Connection
Wire Range
Switch
Size
Connection
Wire Range -
208 175 #14 - 2/0 175 #14 - 2/0 100 #10 - 1/0 100 #10 - 1/0
230 175 #14 - 2/0 175 #14 - 2/0 100 #10 - 1/0 100 #10 - 1/0
460 175 #14 - 2/0 175 #14 - 2/0 100 #10 - 1/0 100 #10 - 1/0
040
575 175 #14 - 2/0 175 #14 - 2/0 100 #10 - 1/0 100 #10 - 1/0
208 175 #14 - 2/0 175 #14 - 2/0 125 #3 - 3/0 125 #3 - 3/0
230 175 #14 - 2/0 175 #14 - 2/0 125 #3 - 3/0 125 #3 - 3/0
460 175 #14 - 2/0 175 #14 - 2/0 100 #10 - 1/0 100 #10 - 1/0
050
575 175 #14 - 2/0 175 #14 - 2/0 100 #10 - 1/0 100 #10 - 1/0
208 175 #14 - 2/0 175 #14 - 2/0 125 #3 - 3/0 125 #3 - 3/0
230 175 #14 - 2/0 175 #14 - 2/0 125 #3 - 3/0 125 #3 - 3/0
460 175 #14 - 2/0 175 #14 - 2/0 100 #10 - 1/0 100 #10 - 1/0
060
575 175 #14 - 2/0 175 #14 - 2/0 100 #10 - 1/0 100 #10 - 1/0
208 175 #14 - 2/0 175 #14 - 2/0 250 #6 - 350 kcmil 250 #6 - 350 kcmil
230 175 #14 - 2/0 175 #14 - 2/0 250 #6 - 350 kcmil 250 #6 - 350 kcmil
460 175 #14 - 2/0 175 #14 - 2/0 100 #10 - 1/0 100 #10 - 1/0
080
575 175 #14 - 2/0 175 #14 - 2/0 100 #10 - 1/0 100 #10 - 1/0
208 175 #14 - 2/0 175 #14 - 2/0 250 #6 - 350 kcmil 250 #6 - 350 kcmil
230 175 #14 - 2/0 175 #14 - 2/0 250 #6 - 350 kcmil 250 #6 - 350 kcmil
460 175 #14 - 2/0 175 #14 - 2/0 100 #10 - 1/0 100 #10 - 1/0
100
575 175 #14 - 2/0 175 #14 - 2/0 100 #10 - 1/0 100 #10 - 1/0
208 380 #4 - 500 kcmil
380 #4 - 500 kcmil
250 #6 - 350 kcmil 250 #6 - 350 kcmil
230 380 #4 - 500 kcmil
380 #4 - 500 kcmil
250 #6 - 350 kcmil 250 #6 - 350 kcmil
460 175 #14 - 2/0 175 #14 - 2/0 100 #10 - 1/0 125 #3 - 3/0
110
575 175 #14 - 2/0 175 #14 - 2/0 100 #10 - 1/0 100 #10 - 1/0
208 380 #4 - 500 kcmil
380 #4 - 500 kcmil
250 #6 - 350 kcmil 250 #6 - 350 kcmil
230 380 #4 - 500 kcmil
380 #4 - 500 kcmil
250 #6 - 350 kcmil 250 #6 - 350 kcmil
460 175 #14 - 2/0 175 #14 - 2/0 125 #3 - 3/0 125 #3 - 3/0
120
575 175 #14 - 2/0 175 #14 - 2/0 100 #10 - 1/0 100 #10 - 1/0
208 380 #4 - 500 kcmil
380 #4 - 500 kcmil
400 (2) 3/0 - 500 kcmil
400 (2) 3/0 - 500 kcmil
230 380 #4 - 500 kcmil
380 #4 - 500 kcmil
400 (2) 3/0 - 500 kcmil
400 (2) 3/0 - 500 kcmil
460 175 #14 - 2/0 175 #14 - 2/0 125 #3 - 3/0 125 #3 - 3/0
150
575 175 #14 - 2/0 175 #14 - 2/0 125 #3 - 3/0 125 #3 - 3/0
208 380 #4 - 500 kcmil
380 #4 - 500 kcmil
400 (2) 3/0 - 500 kcmil
400 (2) 3/0 - 500 kcmil
230 380 #4 - 500 kcmil
380 #4 - 500 kcmil
400 (2) 3/0 - 500 kcmil
400 (2) 3/0 - 500 kcmil
460 175 #14 - 2/0 175 #14 - 2/0 250 #6 - 350 kcmil 250 #6 - 350 kcmil
170
575 175 #14 - 2/0 175 #14 - 2/0 125 #3 - 3/0 250 #6 - 350 kcmil
208 380 #4 - 500 kcmil
380 #4 - 500 kcmil
400 (2) 3/0 - 500 kcmil
400 (2) 3/0 - 500 kcmil
230 380 #4 - 500 kcmil
380 #4 - 500 kcmil
400 (2) 3/0 - 500 kcmil
400 (2) 3/0 - 500 kcmil
460 175 #14 - 2/0 175 #14 - 2/0 250 #6 - 350 kcmil 250 #6 - 350 kcmil
190
575 175 #14 - 2/0 175 #14 - 2/0 250 #6 - 350 kcmil 250 #6 - 350 kcmil
OMM TGZ-1 TGZ 040A through TGZ 190A 15
Field Wiring, Power
The TGZ units are supplied standard with compressor contactors and power terminal block, designed for multi-
point power supply to the unit, no compressor circuit breakers. Available options are:
• Single-point connection to power block with compressor circuit breakers
• Single-point connection to disconnect switch with compressor circuit breakers
• High short circuit current rating with single-point disconnect switch
• Multi-point connection to disconnect switch, no compressor circuit breakers
A factory installed control circuit transformer is standard. Optionally, a field-installed control power source
can be wired to the unit.
Wiring and conduit selections must comply with the National Electrical Code and/or local requirements.
An open fuse indicates a short, ground, or overload. Before replacing a fuse or restarting a compressor,
the trouble must be found and corrected. Tables in the Electrical Data section (page 4) give specific
information on recommended wire sizes.
Unit power inlet wiring must enter the control box through the right side. A 7/8-inch pilot knockout is provided.
Refer to the unit dimension drawings for the location of power and control connections.
!
CAUTION
To avoid equipment damage, use only copper conductors in main terminal block.
Control Power
A factory mounted control transformer is provided to supply the correct control circuit voltage.
16 TGZ 040A through TGZ 190A OMM TGZ-1
Field Wiring Diagram
Figure 4, Field Wiring Diagram
FIELD WIRING FOR TGZ
DWG. 330538901 REV.0D (MOD)
KDL 09-04-08
WITH MICROTECH CONTROLLER
TO COMPRESSOR(S)
AND FAN MOTORS
DISCONNECT
(BY OTHERS)
3 PHASE
POWER
120VAC
CONTROL POWER
GND LUG
UNIT MAIN
TERMINAL BLOCK
FUSED CONTROL
CIRCUIT TRANSFORMER
OPTION
120 VAC
TB1
TB1-20
CHW PUMP RELAY (BY OTHERS)
120 VAC 1.0 AMP MAX
DISCONNECT
(BY OTHERS)
N
FIELD
SUPPLIED
OPTION
10A
FUSE
(BY OTHERS)
CONTROL
CIRCUIT
FUSE
2
1
N
120 VAC
14
11
NOTE: ALL FIELD WIRING TO BE
INSTALLED AS NEC CLASS 1
WIRING SYSTEM WITH CONDUCTOR
RATED 600 VOLTS
SUPPLY
GND
ALARM BELL RELAY
FACTORY SUPPLIED ALARM
FIELD WIRED
ALARM
BELL
OPTION
10
15
CONTROLLER
TB2
ICE MODE SWITCH
(BY OTHERS)
51
52
42
60
40
53
43
55
49
50
ALARM BELL
RELAY
ALARM BELL OPTION
BELL
1 2
COM
NO
AUTO
TIME
CLOCK
OFF
ON
MANUAL
AUTO
OFF
ON
MANUAL
REMOTE STOP
SWITCH
(BY OTHERS)
IF REMOTE STOP
CONTROL IS USED,
REMOVE LEAD 897
FROM TERM. 40 TO 53.
897
4-20MA FOR
LEAVING WATER RESET
(BY OTHERS)
+
-
4-20MA FOR
DEMAND LIMIT
(BY OTHERS)
+
GND
-
33
44
CHW FLOW SWITCH
---MANDATORY–-
(BY OTHERS)
NOR. OPEN PUMP AUX. CONTACTS (OPTIONAL)
41
54
CDW FLOW SWITCH
---MANDATORY–-
(BY OTHERS)
NOR. OPEN PUMP AUX. CONTACTS (OPTIONAL)
N
N
120 VAC
120 VAC
120 VAC
120 VAC
CDW PUMP RELAY (BY OTHERS)
120 VAC 1.0 AMP MAX
TOWER FAN #1 COIL (BY OTHERS)
120 VAC 1.0 AMP MAX
TOWER FAN #2 COIL (BY OTHERS)
120 VAC 1.0 AMP MAX
TB1-12
J15-NO8
TB1-12
J16-NO9
J16-NO10
TB3-90
TB3-91
TB3-92
79
80
N
0-10 VDC
77
78
N
0-10 VDC
COOLING TOWER BYPASS
(BY OTHERS)
COOLING TOWER BYPASS
(BY OTHERS)
TB3
OMM TGZ-1 TGZ 040A through TGZ 190A 17
Figure 5, Control Center Layout
(3) 120V/24V
Transformers
LineV/120V
Control
Transformer
Control
Transformer
Fuses, Primary
Control
Transformer
Fuse, Secondary
Optional Disconnect
Switch
Microtech II
Controller
(2) Circuit
Mechanical
Hi-Pressure Switch
Relays
(4) Compressor
Contactors
Grounding Lug
Location for
Optional External
Overloads
7/8-in. KO for
control wiring
Switches
On Side
KO for Power
Wiring
18 TGZ 040A through TGZ 190A OMM TGZ-1
Start-Up and Shutdown
Pre Start-up
1. With main disconnect open, check all electrical connections in control panel and starter to be sure
they are tight and provide good electrical contact. Although connections are tightened at the factory,
they can have loosened enough in shipment to cause a malfunction.
2. Check and inspect all water piping. Make sure flow direction is correct and piping is made to
correct connection on evaporator and condenser.
3. Open all water flow valves to the condenser and evaporator.
4. Flush the cooling tower (if one is in the system) and system piping to be sure the system is clean.
Start source water pump and manually start hot water pump. Check all piping for leaks. Vent the air
from the evaporator and condenser water circuit as well as from the entire water system. The cooler
circuits should contain clean, non-corrosive water.
5. Check to see that the water temperature thermostat sensor is installed in the correct water line.
6. Making sure control stop switch S1 is open (off) and pumpdown switches PS1 and PS2 are on
“manual pumpdown”, move the main power and control disconnect switches to “on.” This will
energize crankcase heaters. Wait a minimum of 12 hours before starting up unit.
7. Check compressor oil level. The oil level should be at least one-third of the oil sightglass.
8. Check pressure drop across evaporator and condenser, and see that water flow is correct per the
design flow rates and data on pages 4 through 6.
9. Check the actual line voltage to the unit to make sure it is the same as called for on the compressor
nameplate within + 10% and that phase voltage unbalance does not exceed 2%. Verify that adequate
power supply and capacity is available to handle load.
10. Make sure all wiring and fuses are of the proper size. Also make sure all interlock wiring is
completed per McQuay diagrams.
11. Verify that all mechanical and electrical inspections by code authorities have been completed.
12. Make sure all auxiliary load and control equipment is operative and that an adequate cooling load is
available for initial start-up.
Start-up
1. Open the compressor suction and discharge shutoff valves until backseated. Replace valve caps.
2. Open the manual liquid line shutoff valve.
3. Check to see that the unit circuit breakers are in the “off” position.
4. Check to see that the pumpdown switches PS1 and PS2 are in the “manual pumpdown” position and
the control system switch S1 is in the “off” position.
5. Place the main power and control circuit disconnects to the “on” position.
6. Verify crankcase heaters have operated for at least 12 hours prior to start-up. Crankcase should be
warm.
7. Adjust the setpoint on the MicroTech controller to the desired hot water temperature.
8. Start the auxiliary equipment for the installation by turning on the time clock, ambient thermostat
and/or remote on/off switch and chilled water pump.
9. Check resets of all equipment protection controls.
10. Switch the unit circuit breakers to on.
11. Place pumpdown switch(es) PS1 and PS2 to “auto” for restart and normal operation.
12. Start the system by pushing the system switch S1 to on.
13. After running the unit for a short time, check the oil level in each compressor crankcase and check
for flashing in the refrigerant sightglass.
14. After system performance has stabilized, it is necessary that the “Compressorized Equipment
Warranty Form” (Form No. 206036A) be completed to obtain full warranty benefits. Be sure to list
the pressure drop across both vessels. This form is shipped with the unit and after completion
should be returned to the McQuay Service Department through your sales representative.
OMM TGZ-1 TGZ 040A through TGZ 190A 19
Weekend or Temporary Shutdown
Move pumpdown switch(es) PS1 and PS2 to the “manual pumpdown” position.
Note: With the unit in this condition, it is capable of limited pumpdown. To defeat this mode of
operation, simply move control system switch S1 to the “off” position.
!
CAUTION
The compressors must complete pump down before the water flow to the unit is interrupted to
avoid freeze-up damage in the evaporator.
Start-up after Temporary Shutdown
1. Start the source water and hot water flow through the unit.
2. With the control system switch S1 in the “on” position, move the pumpdown switch(es) PS1
and PS2 to the “auto pumpdown” position.
3. Observe the unit operation for a short time, noting unusual sounds or cycling of compressors.
Extended Shutdown
1. Close the manual liquid line shutoff valves.
2. After the compressors have pumped down, stop or bypass the source water and hot water flow.
3. Turn off all power to the unit.
4. Move the control service switch S1 to the “off” position.
5. Close the suction and discharge shutoff valves on the compressor(s) and the liquid outlet
valves at the condenser(s) or receiver(s).
6. Tag all opened disconnect switches to warn against start-up before opening the compressor
suction and discharge valves.
7. Drain all water from the unit evaporator and chilled water piping if the unit is to be shut down
during the winter and exposed to below freezing temperatures. Do not leave the vessels or
piping open to the atmosphere over the shutdown period.
Start-up after Extended Shutdown
1. Inspect all equipment to see that it is in satisfactory operating condition.
2. Backseat the compressor suction and discharge valves. Always replace valve seal caps.
3. Open the manual liquid line shutoff valves.
4. Check circuit breakers. They must be in the “off” position.
5. Check to see that the pumpdown switches PS1 and PS2 are in the “manual shutdown” position
and the control system switch S1 is in the “off” position.
6. Throw the main power and control circuit disconnects to the “on” position.
7. Allow the crankcase heaters to operate for at least 12 hours prior to start-up.
8. Start the source water flow and purge the water piping as well as the evaporator in the unit.
9. Start the auxiliary equipment for the installation by turning on the time clock, ambient
thermostat and/or remote on/off switch.
10. Adjust the setpoint on the MicroTech controller to the desired hot water temperature.
11. Check resets of all equipment protection controls.
12. Switch the unit circuit breakers to “on.”
13. Start the system by pushing the system switch S1 to “on.”
!
CAUTION
Most relays and terminals in the control center are powered when S1 is closed and the
control circuit disconnect is on. Do not close S1 until ready for start-up or serious
equipment damage can occur.
14. Place pumpdown switch(es) PS1 and PS2 to the “auto pumpdown” position for restart and
normal operation.
15. After running the unit for a short time, check the oil level in each compressor crankcase
and for flashing in the refrigerant sightglass (see Maintenance section).
20 TGZ 040A through TGZ 190A OMM TGZ-1
Sequence of Operation
The following sequence of operation is typical for TGZ Templifier models when in the
heating mode. The sequence can vary slightly depending upon options.
Start-up/Compressor Staging (when compressors start and stop)
Stage Up Temperature (displayed on ‘VIEW UNIT TEMP (3)’ screen) is the Condenser
Leaving Water Temperature by which the next compressor to start will stage up (start) after at
least one compressor on the unit has started and is running.
Start Up Temperature (displayed on ‘VIEW UNIT TEMP (3)’ screen) is the Condenser
Leaving Water Temperature by which the first compressor starts. The start up temperature
equals the Stage Up Temperature minus the Start Delta Temperature set point. A higher Start
Delta Temperature set point value will keep the unit off longer and reduce unit cycling at low
loads. However, this high Start Delta Temperature set point will cause a larger excursion from
the Active Heat Leaving Water Temperature set point before the unit starts. Stated another
way, the Start Delta Temperature set point is the number of degrees below the Active Heat
Leaving Water Temperature set point, minus ½ the Control Band, that determines when the
first compressor starts. The Start Delta is in effect for only the first start after all compressors
have been off. Additional compressor starts and stops are determined by the Condenser
Leaving Water Temperature (LWT) with respect to the Control Band only. The Control Band
is automatically set based upon the number of stages (compressors) for the unit. A four (4)
compressor unit will have a Control Band that is 30% of the CondDeltaT set point. A six (6)
compressor unit will have a Control Band that is 20% of the CondDeltaT set point.
The following sequence would occur for the settings shown below for a four compressor unit:
CondDelta T set point = 10.0°F
StartDelta set point = 5.0°F
StopDelta set point = 2.0°F
Heat LWT set point = 140.0°F
The calculated Control Band will be 30% of 10ºF (Cond Delta T) which is 3ºF.
For a cold start-up (no compressors running), the first compressor will start at any temperature
below 133.5°F. Each subsequent compressor will start after the Stage Up Timer has timed out and if
the temperature is below the Control Band, 138.5°F in this case.
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McQuay TGZ 050 Operation and Maintenance Manual

McQuay
Brand
McQuay
Model
TGZ 050
Type
Operation and Maintenance Manual
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